- E-bookThe Annonaceous Fruits Being the Cherimoya, Bullock's Heart, Ilama, Papaya, Soursop and Sugar-Apple Found in the TropicsWilson Popenoe
- E-bookAn Article on the Lychee and its Relatives - Being Fruits of the Sapindaceae Family Found in the TropicsWilson Popenoe
- E-bookAn Article Detailing Miscellaneous Tropical and Subtropical FruitsWilson Popenoe
- E-bookAn Article on the Kaki and its Relatives being Fruits of the Diospyros Family Found in the TropicsWilson Popenoe