15 books
Nature Trails: An Experiment in Out-Door Education (Classic Reprint)
Field Book of Insects, with Special Reference to Those of Northeastern United States, Aiming to Answer Common Questions - Primary Source Edition
Notes on the Distribution and Bibliography of North American Bees of the Families, Apidae, Meliponidae, Bombidae, Euglossidae, and Anthophoridae - Pri
How to Collect and Preserve Insects - Primary Source Edition
String-Figures from the Patamana Indians of British Guiana Volume 12, Nos. 1-5
How to Collect and Preserve Insects
Our Common Butterflies...
String-Figures from the Patamana Indians of British Guiana
Experiments with Drosophila Ampelophila Concerning Evolution
The Variation and Correlations of Certain Taxonomic Characters of Gryllus
String-Figures from the Patamana Indians of British Guiana, Volume 12
Field Book of Insects, with Special Reference to Those of Northeastern United States, Aiming to Answer Common Questions
Field Book of Insects
Notes on the Distribution and Bibliography of North American Bees of the Families, Apidae, Meliponidae, Bombidae, Euglossidae, and Anthophoridae
Geographic Average