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Popular Paid Books & Reference apps in the United States

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
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
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
|
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
100,000+ 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
$24.99
85
1,000+ 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
Aldiko Book Reader Premium
Aldiko Limited
Download one of the best Android eBook Readers now! ★The leading eBook application for the Android platform ★20+ million users from over 200 countries Features: ✔ Support EPUB, PDF formats as well as Adobe DRM encrypted eBooks. ✔ Suppor
$3.87
81
100,000+ downloads
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BOOKS_REFERENCE
Moon+ Reader Pro
Moon+
Better designed book reader with powerful controls & full functions, supports epub, pdf, mobi, chm, cbr, cbz, umd, fb2, txt, html, rar, zip or OPDS formats. ☀Additional benefits in pro version: ✔ Ad-free, faster & smoother ✔ Shake the pho
$4.99
93
100,000+ downloads
|
BOOKS_REFERENCE
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