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Popular Paid Books & Reference apps among people in their thirties

Fox in Socks - Dr. Seuss
Oceanhouse Media, Inc.
Join Fox In Socks in this interactive book app as he plays a tongue-twisting game with Mr. Knox! Explore pictures, learn new vocabulary, and follow along with three fun ways to read! Come see if Fox's tricks with bricks and blocks will con
$3.99
94
5,000+ downloads
|
BOOKS_REFERENCE
SPB English Cards
SPB Software
Traditional flash cards for learning English language enhanced with smartphone technologies like photos, native speakers' dubbing, learning progress visualization, smart adaptive algorithm, and detailed statistics. The program helps you to
$4.95
73
1,000+ downloads
|
BOOKS_REFERENCE
CompTIA A+ 220-701/702 Bundle
Upward Mobility
With detailed explanatory answers written by certified industry experts, our exam prep bundle is superior in content and UI to more expensive competitors. Your satisfaction is important to us and we have a no questions asked refund policy
$7.99
85
1,000+ downloads
|
BOOKS_REFERENCE
賽微隨身典 - 繁中
Cyberon Corp.
Cyberon Talking Dictionary is the most popular mobile phone pronunciation dictionary contains over 110,000 and practical, the British and Chinese word, phrase, contractions, pronounced with high-tech speech synthesis technology to provide s
$3.99
78
1,000+ downloads
|
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
$0.99
93
100,000+ downloads
|
BOOKS_REFERENCE
SPB Spanish Cards
SPB Software
Traditional flash cards for learning Spanish language enhanced with smartphone technologies like photos, native speakers' dubbing, learning progress visualization, smart adaptive algorithm, and detailed statistics. The program helps you to
$4.95
80
500+ downloads
|
BOOKS_REFERENCE
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