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  1. W. O. Robinson, “Agricultural significance of minor elements,” Am. Fertilizer 89, No. 8, 5–8, 24, 26 (1938).
  2. R. A. Steinberg, “Correlation between biological essentiality and atomic structure of the chemical elements,” J. Ag. Research 57, 851–858 (1938).
  3. Annual Review of Biochemistry (Stanford University Press, 1932–1940), Vol. I–IX.
  4. L. G. Willis, Bibliography of References to the Literature on the Minor Elements, third edition (Chilean Nitrate Educational Bureau, New York, 1939).
  5. L. H. Rogers, “A list of trace element publications by the University of Florida Agricultural Experiment Station.” Mimeographed. Florida Agricultural Experiment Station (1940).
  6. L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).
  7. L. W. Gaddum and L. H. Rogers, “A study of some trace elements in fertilizer materials,” (1936).
  8. R. B. Becker and L. W. Gaddum, “The composition of limonites effective and ineffective in correcting ‘bush-sickness’ in cattle,” J. Dairy Sci. 20, 737–9 (1937).
    [Crossref]
  9. J. A. Roberts and L. W. Gaddum, “Composition of citrus fruit juices,” Ind. Eng. Chem. 29, 574–575 (1937).
    [Crossref]
  10. L. W. Gaddum, A. F. Camp, and W. Reuther, “Spectrographic studies of the composition of tissues and corresponding soils of normal and physiologically diseased horticultural crops,” Univ. of Fla. Ag. Exp. Sta.Annual Report, p. 82 (1936).
  11. L. L. Rusoff and L. W. Gaddum, “The trace element content of the newborn rat,” J. Nutrition 15, 169 (1938).

1938 (3)

W. O. Robinson, “Agricultural significance of minor elements,” Am. Fertilizer 89, No. 8, 5–8, 24, 26 (1938).

R. A. Steinberg, “Correlation between biological essentiality and atomic structure of the chemical elements,” J. Ag. Research 57, 851–858 (1938).

L. L. Rusoff and L. W. Gaddum, “The trace element content of the newborn rat,” J. Nutrition 15, 169 (1938).

1937 (2)

R. B. Becker and L. W. Gaddum, “The composition of limonites effective and ineffective in correcting ‘bush-sickness’ in cattle,” J. Dairy Sci. 20, 737–9 (1937).
[Crossref]

J. A. Roberts and L. W. Gaddum, “Composition of citrus fruit juices,” Ind. Eng. Chem. 29, 574–575 (1937).
[Crossref]

Barnette, R. M.

L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).

Becker, R. B.

R. B. Becker and L. W. Gaddum, “The composition of limonites effective and ineffective in correcting ‘bush-sickness’ in cattle,” J. Dairy Sci. 20, 737–9 (1937).
[Crossref]

Camp, A. F.

L. W. Gaddum, A. F. Camp, and W. Reuther, “Spectrographic studies of the composition of tissues and corresponding soils of normal and physiologically diseased horticultural crops,” Univ. of Fla. Ag. Exp. Sta.Annual Report, p. 82 (1936).

Gaddum, L. W.

L. L. Rusoff and L. W. Gaddum, “The trace element content of the newborn rat,” J. Nutrition 15, 169 (1938).

R. B. Becker and L. W. Gaddum, “The composition of limonites effective and ineffective in correcting ‘bush-sickness’ in cattle,” J. Dairy Sci. 20, 737–9 (1937).
[Crossref]

J. A. Roberts and L. W. Gaddum, “Composition of citrus fruit juices,” Ind. Eng. Chem. 29, 574–575 (1937).
[Crossref]

L. W. Gaddum, A. F. Camp, and W. Reuther, “Spectrographic studies of the composition of tissues and corresponding soils of normal and physiologically diseased horticultural crops,” Univ. of Fla. Ag. Exp. Sta.Annual Report, p. 82 (1936).

L. W. Gaddum and L. H. Rogers, “A study of some trace elements in fertilizer materials,” (1936).

L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).

Gall, O. E.

L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).

Reuther, W.

L. W. Gaddum, A. F. Camp, and W. Reuther, “Spectrographic studies of the composition of tissues and corresponding soils of normal and physiologically diseased horticultural crops,” Univ. of Fla. Ag. Exp. Sta.Annual Report, p. 82 (1936).

Roberts, J. A.

J. A. Roberts and L. W. Gaddum, “Composition of citrus fruit juices,” Ind. Eng. Chem. 29, 574–575 (1937).
[Crossref]

Robinson, W. O.

W. O. Robinson, “Agricultural significance of minor elements,” Am. Fertilizer 89, No. 8, 5–8, 24, 26 (1938).

Rogers, L. H.

L. H. Rogers, “A list of trace element publications by the University of Florida Agricultural Experiment Station.” Mimeographed. Florida Agricultural Experiment Station (1940).

L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).

L. W. Gaddum and L. H. Rogers, “A study of some trace elements in fertilizer materials,” (1936).

Rusoff, L. L.

L. L. Rusoff and L. W. Gaddum, “The trace element content of the newborn rat,” J. Nutrition 15, 169 (1938).

Steinberg, R. A.

R. A. Steinberg, “Correlation between biological essentiality and atomic structure of the chemical elements,” J. Ag. Research 57, 851–858 (1938).

Willis, L. G.

L. G. Willis, Bibliography of References to the Literature on the Minor Elements, third edition (Chilean Nitrate Educational Bureau, New York, 1939).

Am. Fertilizer (1)

W. O. Robinson, “Agricultural significance of minor elements,” Am. Fertilizer 89, No. 8, 5–8, 24, 26 (1938).

Ind. Eng. Chem. (1)

J. A. Roberts and L. W. Gaddum, “Composition of citrus fruit juices,” Ind. Eng. Chem. 29, 574–575 (1937).
[Crossref]

J. Ag. Research (1)

R. A. Steinberg, “Correlation between biological essentiality and atomic structure of the chemical elements,” J. Ag. Research 57, 851–858 (1938).

J. Dairy Sci. (1)

R. B. Becker and L. W. Gaddum, “The composition of limonites effective and ineffective in correcting ‘bush-sickness’ in cattle,” J. Dairy Sci. 20, 737–9 (1937).
[Crossref]

J. Nutrition (1)

L. L. Rusoff and L. W. Gaddum, “The trace element content of the newborn rat,” J. Nutrition 15, 169 (1938).

Other (6)

L. W. Gaddum, A. F. Camp, and W. Reuther, “Spectrographic studies of the composition of tissues and corresponding soils of normal and physiologically diseased horticultural crops,” Univ. of Fla. Ag. Exp. Sta.Annual Report, p. 82 (1936).

Annual Review of Biochemistry (Stanford University Press, 1932–1940), Vol. I–IX.

L. G. Willis, Bibliography of References to the Literature on the Minor Elements, third edition (Chilean Nitrate Educational Bureau, New York, 1939).

L. H. Rogers, “A list of trace element publications by the University of Florida Agricultural Experiment Station.” Mimeographed. Florida Agricultural Experiment Station (1940).

L. H. Rogers, O. E. Gall, L. W. Gaddum, and R. M. Barnette, “Distribution of macro and micro elements in some soils of peninsular Florida,” (1939).

L. W. Gaddum and L. H. Rogers, “A study of some trace elements in fertilizer materials,” (1936).

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Figures (1)

Fig. 1
Fig. 1

The biologically essential elements (adapted in part from Steinberg, reference 2). Heavy solid blocks enclose elements long known to be essential. Heavy broken blocks enclose elements whose essentiality is fairly well established. Light solid blocks enclose elements frequently detected in biological materials, but whose essentiality as yet remains unproved.