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Assault on the Unknown

Assault on the Unknown

By Walter Sullivan

McGraw-Hill, 1961, 460 pp

Reviewed by Henry L. Roberts

In This Review

In This Review

Assault on the Unknown

Assault on the Unknown

By Walter Sullivan

McGraw-Hill, 1961, 460 pp

A popular survey of the achievements of the International Geophysical Year.

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Cover for Two Kinds of Time

Two Kinds of Time

By Graham Peck

Reviewed by Henry L. Roberts

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