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Learn to mate your budgies together to get the very best colour combinations. This handy guide includes chapters on the colouration and correct names of the different budgerigars. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

What do we know about behavioral analysis and intervention in educational settings? Given that educational institutions were among the first to embrace the new technology of behavior change in the late 1950s and early 1960s, it is apparent that we have had the opportunity to learn a great deal. The evolution of the field of behavior therapy has witnessed a change in the behavior therapist from an adolescent fascination with repeatedly demonstr...