Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 21-44
Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 45-56
Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 57-95
Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 97-105
Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 112-114
Published in Botanical Museum Leaflets, Harvard University, in 1953, in volume 16, pages 115-172