Note: Not all fake books or real books have the same format, most will have sheet music with chords marked, some also have lyrics, a few have tablature, they are sometimes also available in different keys and arrangements to suit different instruments.
For an excellent collection of fakebooks to buy, checkout www.sheetmusicplus.com, who have a selection of some 1200+ to chose from, they also have good search facilities AND include content indexes for their books.
Song/Tune Title
Book
Lester Leaps In
SRB
Lester Leaps In composed by Lester Young
JJRB
Lester Left Town
RLUJFB
Lester Left Town
UJFB
Let 'Em In
BFBE
Let 'Em In
PCFB
Let 'em In
RLBFB
Let a smile be your umbrella
AJFB
Let A Smile Be Your Umbrella
BFBE
Let A Smile Be Your Umbrella
PCFB
Let A Smile Be Your Umbrella
RLBFB
Let All Mortal Flesh Keep Silence
HFB
Let All Mortal Flesh Keep Silence composed by Picardy