Disc Recording Equalization Demystified by Gary A. Gallo
This is one of the best non-mathematical introductions to the RIAA disc recording playback chain written.
Gallo worked at the Crane School of Music in New York for 30 years as an audio engineer, where he also received a Bachelor of Music in Music Education in 1973 and in 1974 a Master of Arts in Music History. He has contributed many technical articles in professional and DIY Audio publications.
Pictured above: A Neumann Cutting Lathe used to make the record master. Picture courtesy of Bakery Mastering