Mark Brader:
Collect all 12! Actually, I don't know how many of these there are.

Clive Feather:
There are no books in this series on the W&C, ELL, DLR, or Tramlink, but
there are other books on all of these (large and expensive in the case
of the W&C).

"Underground to everywhere -- smallest line, largest book"?
No, wait, I don't think I have the right. :-)

Actually, that reminds me of one. When I said Clive's list hadn't
added any general books on the Underground since the old copy I posted,
I was wrong. [His own fault for sticking pictures in there, when my
comparison was keying on the bullets before each title. :-)] There is:

Underground to Everywhere, by Stephen Halliday, 2001,
Sutton Publishing, H248mk, ISBN 0-7509-2585-X.

(k means "colour plates between some pages"). The paperback is ISBN
0-7509-3843-9, medium page size. Like Glover's, this one covers all
parts of the system, but with more attention to "people" topics than
to engineering and technical ones.
--
Mark Brader, Toronto | "Gwyneth Paltrow always says I'm a
| shameless name dropper" -- Roger Ford

My text in this article is in the public domain.