You may also wish to search for items by Beckstead, H. and Beckstead.
Only one matching reference was found.
Neville, G.A.; Beckstead, H.D.; Shurvell, H.F., Fourier transform Raman and infrared study of nitrazepam, nimetazepam, clonazepam and flunitrazepam., Vib. Spectrosc., 1991, 1, 287. [all data]