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No author has gone as far as Doerfler in covering methods of mental calculation beyond simple arithmetic. Even if you have no interest in competing with computers you'll learn a great deal about number theory and the art of efficient computer programming. ¿Martin Gardner

Featuring key campground features, facilities, and activities, this guide''s 130+ maps take you right where you want to go. This is the most complete, map-packed, best-organized camping guide you can own.

You've always wondered about those peculiar and colorful town names. Now here comes the full and often remarkable explanantions. Perfect for new Texans, transplanted Texans, and history buffs, this book blends human interest, curious circumstances, humor and even constroversy with local historical facts surrounding the origins of Texas town names.

This book is a unique guide to tell you when, where, and how to catch more than 35 varieties of sport fishes.

This book provides a practical approach to all aspects of owning a puppy. It shows you the wisest, most comprehensive ways for both dog and owner to survive the adventures of puppyhood.

This book gets you into the action fast, no matter what kind of fish you are after ¿redfish, snook, cobia, snapper, flounder even tarpon.

This book takes the reader to almost 200 parks, refuges, and hot spots for migratory and resident birds throughout Pennsylvania. Details on 7 geographical regions include 34 maps make this the most comprehensive statewide guide available to Pennsylvania birding sites.

The third edition of this unique encyclopedia lists all satellites ever in orbit. It describes more than 22,000 satellites, payloads, plateforms, rockets and debris clusters from all countries, including the thousands of man made objects that remain in orbit from as far back as 1958 as well as thousands that are no longer in orbit.

This cookbook is an exciting patchwork collection of authentic recipes as varied as the ethnic makeup of Texas.

Packed with maps and information on 87 state and national parks, lakes, beaches, forest, and recreation areas. For quick and easy access, this guide divides Southern California into three regions so you can better plan your vacations, holidays and weekend getaways.

For Texas residents and visitors alike, this book is your best guide to the outstanding birding opportunities in the Lone Star State. It reveals where you can find resident, migrant, and rare birds. Explicit driving directions, maps, checklists, and detailed descriptions of hot birding sites make this book the perfect guide for nature lovers, casual bird observers, Life List compilers, and dedicated ornithologists.