John Barr / Budo Aikido Association (1983)
Summary: This book is the basic curriculum for "kukyu" rank in "Budo Aikido", which seems to be a system comprised of elements of Aikido, Karate. JuJitsu and Judo (primarily Karate, it appears). Included are descriptions of warmups and stretching, and some basic techniques.
M.G. Harvey / Emerson Books (1967)
Summary: This is not strictly an Aikido book, but does have an Aikido component, along with Judo and Karate, and much information common to most Japanese arts, and known to aikidoka. It is a presentation of the practical aspects of these arts, and their use in real-world self-defense situations. First published in the UK in 1967, and later released in the US (1975) by Emerson Books.