The 23rd book published by Bantam Publications is Tarzan in the Forbidden City by Edgar Rice Burroughs. First published Tarzana, CA: ERB, 1938 as Tarzan and the Forbidden City. The Bantam edition is abridged.
In common with all but one of LA Bantam's books Tarzan in the Forbidden City is 100 pages long and is 110 mm (4 5/16") wide by 152 mm (6") tall. Cover and pages are made from high acid pulp paper. The page collation is:
[1] title page,
[2] copyright page,
3-100 Tarzan in the Forbidden City.
The copyright date is 1940.
In common with most LA Bantams there are variant covers, three with text and one illustrated. The text covers are dark blue/light green, strong yellowish green/light orange yellow and strong yellowish green/light blue. The illustrated cover is below.