E. M. East
A STUDY OF PARTIAL STERILITY IN CERTAIN HYBRIDS
Genetics 1921 6: 311–365
[PDF]  

J. C. Phillips
A FURTHER REPORT ON SPECIES CROSSES IN BIRDS
Genetics 1921 6: 366–383
[PDF]  

Harry H. Laughlin
DICE-CASTING AND PEDIGREE SELECTION. EXPERIMENTS WHICH PICTURE MATHEMATICALLY CLOSE ANALOGIES BETWEEN DICE-CASTING AND CERTAIN BREEDING PHENOMENA
Genetics 1921 6: 384–398
[PDF]  

Karl Sax
STERILITY IN WHEAT HYBRIDS. I. STERILITY RELATIONSHIPS AND ENDOSPERM DEVELOPMENT
Genetics 1921 6: 399–416
[PDF]  

W. H. Eyster
THE LINKAGE RELATIONS BETWEEN THE FACTORS FOR TUNICATE EAR AND STARCHY-SUGARY ENDOSPERM IN MAIZE
Genetics 1921 6: 416
[Abstract] [PDF]