Books about Human-alien encounters -- Fiction (sorted alphabetically)
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life watch Lester Del Rey
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Lights on Precipice Peak Stephen Tall
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Little Fuzzy H. Beam Piper
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Little Knowledge R. R. Winterbotham
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Little men of space Frank Belknap Long
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Little Monsters Come Ray Cummings
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Little Pets of Arkkhan Bill Garson
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Lonely Ones Edward W. Ludwig
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Lord of a Thousand Suns Poul Anderson
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Lorelei Charles V. De Vet
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Lumen Camille Flammarion
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Lunarian Professor and His Remarkable Revelations Concerning the Earth, the Moon and Mars James B. Alexander
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Lunar Station Harl Vincent
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Madcap Metalloids Verne Athanas
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Madman From Earth Keith Laumer
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Madmen of Mars Erik Fennel
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Man From Siykul Richard Wilson
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Manners and Customs of the Thrid Murray Leinster
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man who liked lions John Bernard Daley
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Margenes Miriam Allen De Ford
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Martian Allen Glasser and A. R. Hilliard
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Martian: A Novel George Du Maurier
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Martians and the Coys Mack Reynolds
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Marty the Martian Arnold Marmor
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Master Race Richard Ashby