How to make spectacles at low cost / Peter Spoerer

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Citation
Spoerer, Peter, WHO Programme for the Prevention of Blindness, International Centre for Eye Health (London, U.K.) & Christoffel Blindenmission. (1995). How to make spectacles at low cost / Peter Spoerer. World Health Organization. https://apps.who.int/iris/handle/10665/65618
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WHO/PBL/95.50190 p.