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Filtering by: Collection Signs of the Times Subject Light -- Physiological effect

Substitute for sunlight

Author:

Shryock, Harold (Edwin Harold) (1906-2004)

Part of:

Signs of the Times

Subject:

Solar radiation simulation, Sunshine -- Physiological effect, Your health questions answered, and Light -- Physiological effect

Source:

Seventh-day Adventist Periodical Index

Description:

Signs of the Times.