Jon Pearson / Vermilion (1991)
Summary: This is a reprinted version done in 1997 of the 1991 book "An Introduction to Aikido" by the same author, but different publisher. The text is identical. It is a basic overview of the history, philosophy, and practice of Aikido, with an emphasis on the methodology of training and advanced training.
Jon Pearson / Macdonald and Co. (1991)
Summary: This is exactly the same text as is found in "Aikido: The Essential Introductory Guide" by the same author.