Reference citation:
Robertson, C. 1929. Flowers and insects: lists of visitors to four hundred and fifty-three flowers. Carlinville, IL, USA, C. Robertson.

Source citation:
Sarah E Miller. 6/25/2015. Species associations manually extracted from Robertson, C. 1929. Flowers and insects: lists of visitors to four hundred and fifty-three flowers. Carlinville, IL, USA, C. Robertson.

Source archive URL:
https://github.com/millerse/Flowers-and-insects-lists-of-visitors-to-four-hundred-and-fifty-three-flowers/archive/318341b23905739413008f5c751c05318ff5cb00.zip