dB The Sound Engineering Magazine267 issues* on 1 USB These are NOT physical manuals db Magazine covered audio engineering.from November of 1967 to 1994. Published monthly, in 1986 frequency was reduced to 6 times a year. *some PDFs have bimonthly issues, so 228 PDFs total Why spent money on one issue when you can get all these for a great price? View on any computer, laptop, tablet, smartphone, iphoneSoftware to view the files is included F.A.Q Are these physical books?No. These are NOT physical books but electronic documents that you can view on your computer, tablet or your mobile phone. What devices can I use to view this document? You can view these ebooks on all computers (Mac or PC), tablets and eReaders such as iPad, Barnes & Nobles Nook, Amazon Kindle, Kobo, Sony eReader etc. You can also read on any smart phones such as iPhone, Samsung Galaxy, Android Phones. Special apps or software are required to open the documents. If you need help, let us know. Payment We accept all major credit cards and paypal Shipping You will receive an USBMajority of our shipment are via USPS/FedEx with tracking number CopyrightThe materials included on this DVD are all in the Public Domain and you can freely download them yourself one by one. You are not paying for the manuals themselves but our time to collect, process, restore, and create the DVD and the cost of materials, fees and shipping, therefore permissible under the "Fair Use" exemption clause of the current U.S. Copyright Act.