The Leguminosae, a Source Book of Characteristics, Uses, and Nodulation - Oscar Nelson Allen, Ethel K. Allen - Google Books

https://books.google.de/books?id=6gUXRNc6sDoC&pg=PA636#v=onepage

This encyclopedic global survey of leguminous root nodulation, the result of 45 years of research by O. N. Allen and Ethel K. Allen, is the only one of its kind, a massive effort incorporating all of the 750 known genera of Leguminosae, which, in turn,…