Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 125-136

Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 137-162

Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 163-181

Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 191-194

Published in Botanical Museum Leaflets, Harvard University, in 1961, in volume 19, pages 195-214