Inquiry re book on polarity

My apologies if this is not the proper forum for this post, but I am only asking for advice on possible value of an item, not actually selling it. I have a copy of The Wood Effect, a 100-page booklet by R. C. Johnsen published in 1988, about polarity inversion, in good condition. What if any value might this title have for audiophiles?
Have you googled R. C. Johnsen Wood Effect: Unaccounted Contributor to Error Confusion in Acoustics and Audio?

Check Amazon and Ebay.
Its worth 5 cents to Audiophiles maybe.