StillTotallyADD: I just remembered I received this book at the 1958 convention in NY.
The release of the book was mentioned in the 1959 Yearbook:
Thursday afternoon, July 31, was paradisaic in both
its assembly and in what it produced. The surroundings
of the speakers' platforms of both stadiums were paradisaic
in their physical beauty. The audience of 145,488
all roundabout were enjoying a feast of Christian association
and Kingdom truths in a spiritual paradise.
Their appreciation of this fact was sharpened by the
speech of the Society's president entitled "Maintaining
Our Spiritual Paradise." He crowned the occasion by his
entirely unexpected display and release of the glowingly
beautiful, handsomely illustrated book of 256 pages,
bearing the title "From Paradise Lost to Paradise Regained."
This book wastes no time and space discussing
false doctrines of worldly religions, but simply explains
the God-honoring truths of the sacred Bible as these
came to the surface in the outworking of God's purpose
to restore obedient humankind to an everlasting earthly
paradise. But this restoration has to be preceded by the
establishing of God's heavenly kingdom and his restoring
first a spiritual paradise for his faithful Christian
witnesses. It was this spiritual paradise that had to be
maintained now with faithfulness and fruitfulness by
its blest, happy inhabitants.
The book on Paradise had been published, not with
children in mind, but for the purpose of satisfying the
need and craving of adult persons in many lands who
needed a primary or elementary manner of approach
to the pure truths of God's Word. After the session there
was many an assembler that took copies of the book
in large quantity. Delight went permeating the mighty
hosts assembled.
The Paradise book was never intended to target children - it was the illustrations and simplified language that made it an ideal book for conducting family book studies. In the congregations of the late 50s and early 60s, an influx of children occurred. The boom in children happened after Knorr et al relaxed the pre-war instructions on remaining single and childless.