This is a nice, clean complete first edition set of Audels Plumbers & Steam Fitters Guides, Volumes 1-4, (Copyright in 1925 Volume 1-3, 1926 Volume 4). They are all in good to good++ condition with a leather like cloth soft-covers in green color (rare color), with gold lettering on the spine, and gold page edges. The outside covers are in good++ shape, but have some minor imperfections and wear, yet are well attached, not torn or seperated. Note the nicely embossed design on the front covers. All have good bindings and hinges, clean pages, no scribbling, torn or missing pages noted, minimal corner wear or minor bumped corners. The pages are clean and white, with the exception of the blank inside cover pages area has some minor darkening or age toning. A few pages have fold crease and a few tiny smudges on a few of the volumes. We note that each volume lays flat on a table top. The gold gilt pages edges are very nice with the exception of one small ding on the top page edges of volume 1 & 3, minor but noted. Overall a nice looking, and complete set! Size of each book: 5.0" x 6.7". About 1900 pages total, with thousands of diagrams, pictures and instructions on about every known subject on plumbing work in this period, including: Mathematics, physics, measuring devices, materials, sheet metal, tools, lead work soldering, joint wiping, bending beating, sanitation water supply, drainage, sewage disposal, Soil pip and joints, fittings, valves faucets and cocks, fixtures, boiler fittings, marine pipe fitting, flexible water tubing, heating & ventilation, steam heating boilers, refrigeration, air conditioning, oil burners, gas burners, meters etc., gas appliances, drawings, how to read drawings, geometry, pattern cutting, boiler plate work, blacksmithing, brazing, gas engines, oil engines, electric motors, are many of the subjects covered in this set. About the best instruction manuals available at the time they were printed. A top quality used, vintage, complete set!