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Albert M. Kligman, MD, co-author of the article, "Further Sunscreen Studies of Aminobenzoic Acid," published in the June Archives (105: 851-855, 1972), has written that "throughout, we recorded the amount applied in terms of sq cm, when, in fact, we meant to say sq in. It is almost impossible to deliver 60 μl (0.06 ml) to 1 sq cm. Indeed, 60 μl/sq in is a rather generous dose, but can be laid down by applying the solution slowly, thus enabling the hydroalcoholic vehicle to evaporate."
For "Sq Cm" Read "Sq In. Arch Dermatol. 1972;106(4):582. doi:10.1001/archderm.1972.01620130096024