https://www.sailplaneandgliding.co.uk/archive/books This is an amazing collection of old, out of print soaring books which have been scanned into PDF files. They are FREE downloads. Some of the more current books are only available as small samples, but many older books are available as full books. Download your copy of "Slingsby Sailplanes" or "On Glidign and Soaring" by Robert Kronfeld, or "Silent Flight" by Ann Edmunds (Welch), to name only a few of the available gems.
I Can Print These For You Let me know if you want a printed and bound version of any of these free downloads. Sometimes it is nice to have a printed version in hand - rather than a digital version to read only at your computer. I can print it on 8.5 x 11" paper, double-sided, using my color laser printer, and bind it with clear plastic covers and a "VeloBind" binder for20 cents/page. The finished product looks great.