Seed farming in Britain : a practical treatise on the cultivation of vegetables for the production of seeds.

Mode of access: Internet.

Patents for Inventions. Abridgments [of] Specifications Relating to the Preparation of India-Rubber and Gutta Percha

Mode of access: Internet.

Rubber-content of North American plants,

"Literature cited": p. 65.

India rubber & tire review.

Mode of access: Internet.

Plants, seeds, and currents in the West Indies and Azores; the results of investigations carried out in those regions between 1906 and 1914,

Mode of access: Internet.