The Foundations of Fear Anthology series by Robert A. Heinlein consists of 4 books, published between 1992 and 1994. The series begins with An Exploration of Horror: Foundations of Fear (With: George R.R. Martin,David G. Hartwell,Peter Straub,Richard Matheson,Daphne du Maurier,Clive Barker,Carlos Fuentes,Arthur Machen,Gerald Durrell).
The Future History/Heinlein Timeline series by Robert A. Heinlein consists of 11 books, published between 1939 and 1967. The series begins with Misfit.
The Heinlein's Juveniles series by Robert A. Heinlein consists of 12 books, published between 1947 and 1958. The series begins with Rocket Ship Galileo.
The The Road to Science Fiction series by Robert A. Heinlein consists of 1 book, starting in 1982. The series begins with The Road to Science Fiction 4: From Here to Forever (By: James Edwin Gunn).
The World As Myth series by Robert A. Heinlein consists of 4 books, published between 1973 and 1987. The series begins with Time Enough for Love.