Pantone systems books for PMS color matching solid to process color (PMS to CMYK) , process color formulas and Pantone formula guide. From 1992s may not be 100% up to date as there are new PMS colors since then but most colors are here . Books are in excellent shape.
Also a printer’s Variable Process Color Tint guide, 17 3/4” x22 3/4’, 24 pages on coated and uncoated stock (12 and 12), samples of screen mixes in increments of 10%. Was used when I got it, but while corners are dog eared the color on inside pages is in excellent condition. A very valuable and unusual book for creative 4 color process printing.
I had a graphic design business for over 36 years, these books were always closed and kept away from exposure to light when not in use.