Art of the Quick-Draw by Ned Nederlander (
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Increases your Firearms skill. This manual is simply lying on the ground when you reach the second floor in the Society of Leopold headquarters in Malibu.
Brawling Manual (
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Increases your Brawl talent. Found on a table in one of the rooms inside the Downtown district's Empire Arms Hotel.
Bustin' It: Harmful If Swallowed Hint Book (
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Increases your Melee skill. I snagged myself one of these on a table in the Fu Syndicate building in the Chinatown district.
Computers For Grandma (
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Increases your Computer knowledge. This manual can be purchased from Trip's pawnshop at the beginning of the game.
Dodge II (
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Increases your Dodge talent. To get one of these tomes, ransack the desk inside the library of the Giovanni Stronghold during the Italian Dinner quest.
Finance Manual (
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Increases your Finance knowledge. Snatch one of these manuals from the desk of Jezebel Locke's suite in Downtown's Empire Hotel.
Kendo For Advanced Students (
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Increases your Melee skill. You can obtain one of these manuals on the bedroom floor of apartment #2 in Downtown's Skyline Apartments.
Peepin' - A Voyeur Field Guide (
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Increases your Stealth skill. You'll be able to obtain one of these guides in the apartment just across the hall from your haven above Trip's Pawnshop.
Scarlet Torkelson: Circus Performer (
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Increases your Dodge talent. Snag yourself one of these manuals on the floor of the library in Dr. Grout's Mansion.
Security Manual (
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Increases your Security skill. The only location I've found one of these is in the camera room of the Museum of Natural History in the Downtown district.
So You Wanna' Shoot Things? (
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Increases your Firearms skill. This manual can be purchased from Trip's pawnshop at the beginning of the game.
The Cowboy's Guide to Cyberspace by Case (
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Increases your Computer knowledge. One of these manuals can be found on a desk in the Ground 0 Internet Cafe in the Hollywood district.