The most reliable source for a complete PDF download is the Internet Archive.
If you are looking for a PDF primarily to copy color hex codes, interactive web directories are often much faster and more accurate than a static document: japanese dictionary of color combinations pdf link
Because Sanzo Wada died in 1967, his original 1933-34 Japanese-language volumes are now in the public domain in most countries (Life + 70 years). You can find a raw, high-resolution scan of the original 6-volume set via . The most reliable source for a complete PDF
A Complete Guide to Sanzo Wada’s Japanese Dictionary of Color Combinations japanese dictionary of color combinations pdf link