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Field guide to the detection and control of xerophthalmia / Alfred Sommer.

Vitamin A supplements : a guide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia / prepared by a WHO/UNICEF/IVACG Task Force.

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Field guide to the detection and control of xerophthalmia / Alfred Sommer.

Vitamin A supplements : a guide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia / prepared by a WHO/UNICEF/IVACG Task Force.