Cover art
Foster, Alan Dean. Parallelities. Ballantine/Del Rey 1998.

Foster, Alan Dean. Parallelities.
Summary: A tabloid newspaper reporter interviewing a weird scientist is affected by an experiment gone awry and uncontrollably pops from parallel world to parallel world.
Comments: Only one or two of these worlds are historically different, and detail about them is minimal.

Published: Ballantine/Del Rey 1998 (0345424611); and SFBC 1998 (1568659482).
Bookstore: Listed by Amazon.com in paperback.