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Popular Paid Books & Reference apps in the United States

Knots 3D
Nynix LLC
Tie, untie and rotate more than 100 knots with just your finger! Knots 3D will give you a whole new perspective on knots! Grab some rope and have fun! - #1 Knot Reference in 75 Countries* - Included in Scouting Magazine's "Ultimate List
$.99
93
50,000+ downloads
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BOOKS_REFERENCE
Moon Phase Pro
Udell Enterprises, Inc
<b>All-new HD imagery!</b> Spectacular, interactive 3D simulation of the moon, right down to the shadows in the craters and earthshine on the dark side. Touch screen control changes date and time as seen from your location - the moon tracks
$.99
94
100,000+ downloads
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BOOKS_REFERENCE
Sundroid Pro Sunrise Sunset
Visalia Mobile Ltd
Calculates sunrise, sunset, twilights, golden hours, length of day, the path of the sun and moon, moonrise & moonset times and more for any date, anywhere in the world. Handy for astronomy, photography, outdoor activities, planning gardens,
$3.33
93
10,000+ downloads
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BOOKS_REFERENCE
Dictionary - M-W Premium
Merriam-Webster Inc.
In addition to all the definitions from Merriam-Webster's Collegiate Dictionary, and all the synonyms and antonyms from Merriam-Webster’s Collegiate Thesaurus, the app offers voice search – to let you look up a word without having to spell
$2.99
88
50,000+ downloads
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BOOKS_REFERENCE
WolframAlpha
Wolfram Group
Remember the Star Trek computer? It's finally happening--with Wolfram|Alpha. Building on 25 years of development led by Stephen Wolfram, Wolfram|Alpha has rapidly become the world's definitive source for instant expert knowledge and computa
$2.99
92
500,000+ downloads
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BOOKS_REFERENCE
Dictionary Pro
Farlex
The Free Dictionary PRO gives you the power of the world's most comprehensive dictionary with or without Internet, and with no ads! English, Spanish, and 12 other dictionaries, all available online or offline. Translate English into more th
$3.99
91
10,000+ downloads
|
BOOKS_REFERENCE
Oxford Dictionary of English
Mobile Systems
*** 50% Off - limited time offer *** The leading single-volume English dictionary, the Oxford Dictionary of English is the foremost authority on current English usage. * Offers the most comprehensive coverage of English from around the
$9.99
85
1,000+ downloads
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BOOKS_REFERENCE
Calibre Companion
MultiPie Ltd
A free demo version is now available. See the end of this description for details. Calibre Companion (CC), recommended by calibre developers, is three applications in one: - a superb device-based calibre library organizer - a high-performa
$4.19
92
10,000+ downloads
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BOOKS_REFERENCE
TerraTime
Udell Enterprises, Inc
Visually stunning real-time virtual Earth. Fed by satellite imagery to display day/night, clouds, seasons, sun, moon and more. Day/night clock (with widget) tracks phases of the moon, sunrise, sunset and transit times. "Superbly stylish,
$2.99
89
50,000+ downloads
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BOOKS_REFERENCE
Oxford Advanced Learner's 8
Oxford University Press ELT.
Improve your English language skills with the Oxford Advanced Learner’s Dictionary. Understand what words mean. Learn how to say them. Know how to use them. --------------- For more information please visit our Oxford Learner’s Dictionarie
$30.69
89
10,000+ downloads
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BOOKS_REFERENCE
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