Books dedicated expensively to the subject of palindromes are very rare. One in great demand is the book "Palindromes" by G. R. Clarke (Glasgow, David Bryce & Son, 1887). Some years ago, Dmitri Borgmann told me in a letter that his firm. Research Unlimited, had not been able to find a copy of the book, and he doubted that it ever really existed.
"An Early Work on Palindromes,"
Word Ways: Vol. 28
, Article 20.
Available at: http://digitalcommons.butler.edu/wordways/vol28/iss2/20