Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general ([A.T. De la Mare Ptg. and Pub. Co, 1911)

A second supplement to, and summary of Stewart and Corry's flora of the North-east of Ireland - Corry, Thomas H. (Thomas Hughes), 1859 -1883 (Belfast Naturalists' Field Club, 1923)