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Popular Paid Books & Reference apps in the United States

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
$0.99
94
100,000+ downloads
|
BOOKS_REFERENCE
Brilliant Quotes PREMIUM
lammar
This is the most advanced, yet elegant and user friendly quotation app on the market. It has been recently redesigned to accommodate modern interface and changes suggested by the community. Download this app and add long-lasting value to yo
$2.49
94
5,000+ downloads
|
BOOKS_REFERENCE
Knots 3D
Nynix LLC
Tie, untie and rotate more than 90 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 o
$0.99
94
10,000+ downloads
|
BOOKS_REFERENCE
Dictionary - M-W Premium
Merriam-Webster Inc.
In addition to all the definitions from Merriam-Webster's Collegiate Dictionary, the app offers voice search – to let you look up a word without having to spell it – along with synonyms, antonyms, example sentences, Word of the Day, Favorit
$2.99
88
50,000+ downloads
|
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
Calibre Companion
MultiPie Ltd
Calibre Companion (CC), recommended by calibre developers, is three applications in one: - a superb device-based calibre library organizer - a high-performance WiFi-based calibre device emulator - a calibre content server (web access) clien
$3.33
93
10,000+ downloads
|
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
|
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 the official web-site of the Oxf
$30.69
88
5,000+ downloads
|
BOOKS_REFERENCE
Moon+ Reader Pro (50% OFF)
Moon+
******************** To celebrate the 4th anniversary, Moon+ Reader Pro is on sale in Aug 2014 (50% off, $4.99 -> $2.49) ******************** Better designed book reader with powerful controls & full functions, supports epub, pdf, mobi, ch
$2.50
93
100,000+ downloads
|
BOOKS_REFERENCE
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