A wonderful blog devoted to scans of vintage graphic design has a series of seriously incredible posts with dozens of old Japanese book and magazine covers.
–Tokyo Flashback – Vintage Design and Illustration From Japan
—Oedipus at Hiroshima – Living Design in Japan
—Give Us Back Man – Japanese Graphic Design
—Early 20th century Japanese magazine covers
—Early 20th century Japanese book covers
—Japan’s First Illustrated Book
—Mad Men and Friends
—Forty-five thousand dollar leftovers
—Yukihiko Tajima’s Gion Matsuri
—Eraserhead vs. Protractorhead
—Takei Takeo Lab of Ornithology
—Takeo Takei – Children’s Day in Japan, 1936
—The Wonders of Life on Earth – Yokoo details
Some particular favorites of mine are this cover of the Japanese translation of Kipling’s The Jungle Book, from 1928.
This super art-deco airplane and city-scape.
This Osaka Puck cover, which reminds me of a Japanese version of DC’s golden age Sandman character.
This cover to Forensic Science Magazine.
This boy riding a rabbit like it’s Falkor.
This poster for what I think was a stage play by the name of 夜叉奇想, or “Demon Fantasy,” by Kara Juro.
And this lovely little Children’s book by Takeo Takei.
But they’re all pretty great, and I recommend looking at every single one.