@book{bhlitem43820, title = {Flowers and insects; lists of visitors of four hundred and fifty-three flowers }, copyright = {Public domain. Published 1923-1963 with notice but no evidence of copyright renewal found in Stanford Copyright Renewal Database. Contact dcc@library.uiuc.edu for information.}, url = {https://www.biodiversitylibrary.org/item/43820}, note = {https://www.biodiversitylibrary.org/bibliography/11538}, publisher = {Carlinville, Ill, n.p, 1928}, author = {Robertson, Charles,}, year = {}, pages = {234}, keywords = {Bees|Fertilization of plants|Flowers|Illinois|Insects|Macoupin County|}, }