Document Acanthaceae of South-Eastern Asia. Manuscript, Volume 1 (pp.1-126) Online content Unit ID: CLA/2/2/
Document Acanthaceae of South-Eastern Asia. Manuscript, Volume 2 (pp.127-537) Online content Unit ID: CLA/2/2/
Document Alexander Wollaston. Photographs of the Utakwa expeditions, 1912-13, together with a reprint of H.N. Ridley. The botany of the Utakwa Expedition, Dutch New Guinea, Linnean Society, 1914 Online content Unit ID: HNR/1/4