Analysis of information sources in references of the Wikipedia article "Index Kewensis" in English language version.
Introduction to the original 1991 printed version
Cumulated Index Kewensis: Original 2 volumes plus supplements 1-16: Microfiche version of cut-up set in Kew Library.
Cumulated Index Kewensis: Original 2 volumes plus supplements 1-16: Microfiche version of cut-up set in Kew Library.