A Guide to Musucal Acoustics by H Lowery,some grubbyness to dustwrapper,original owners inscription,otherwise VGC. 94 pages. Really unusual manual to musical acoustics,very thorough and (to me!) technical. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=220209690839&ssPageName=STRK:MESE:IT