Include in Parrots and Parrot-like Birds in Aviculture published in the 1920s by Hastings Russell,the Marquess of Tavistock

I have added the entries on the blue macaws in Parrots and Parrot-like Birds in Aviculture published in the 1920s by Hastings Russell,the Marquess of Tavistock, later 12th Duke of Bedford, as well as those published by E.J.Boosey in Parrots, Cockatoos and Macaws in 1956 to the section described as Historical Documents. They will, however, also be included under the appropriate section on the blue macaws in aviculture. Fortunately website programming permits this fairly easily. I have decided to draw a line in the mid-1970s when modern fieldwork on the blue macaws started in earnest under pioneering biologists such as Carlos Yamashita in Brazil and also when aviculture really started to use modern technology to improve breeding results. The last items on the website described as a "Historical Document" will be from Rosemary Low's first major work The Parrots of South America published in 1972 and thus just before the watershed mentioned above. If any website visitor disagrees with this, please send an e-mail.