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Geographic variation in the Richardson grouse
Ser 4, Vol 20, Page 1
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The flora of the Revillagigedo Islands
Ser 4, Vol 20, Page 9
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The genus Pogogyne
Ser 4, Vol 20, Page 105
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New species of plants from Western North America
Ser 4, Vol 20, Page 135
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The diatoms of Sharktooth Hill, Kern County, California
Ser 4, Vol 20, Page 161
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A new subspecies of coral snake from Guatemala
Ser 4, Vol 20, Page 265
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Birds and mammals from the Kootenay Valley, Southeastern British Columbia
Ser 4, Vol 20, Page 269
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Miscellaneous studies in the Elateridae and related families of Coleoptera
Ser 4, Vol 20, Page 291