Up for sale is lMEDICAL GAS AND VACUUM SYSTEMS INSTALLATION HANDBOOK by J.Hart, 2015 Edition. I'll also include ASSE International  Professional Qualifications Standard book (it's in fair condition).  Please, read the description to the end and review all photos. 
Handbook is in good condition.  At a glance, there appears to be no markings on pages; binding is tight.  There are some scribbles on the cover.  It also shows some shelf/edge wear.

Standard book is in poor condition. Pages are clean, binding is tight, but cover is soiled, and back cover's upper corner is soiled. Also, this book shows a bit more than average shelf/edge wear. 

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