Changes to stamp 153226

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March 11, 2021, 7:16 pm UTC . . Stan Shebs . . update - cv -> a
January 12, 2018, 5:43 am UTC . . Stan Shebs . . update - dt 2438 -> planes over landscapes (1937)
February 16, 2012, 12:39 am UTC . . Stan Shebs . . update - denom 1/2p -> 1/2p
June 30, 2011, 12:28 pm UTC . . Stan Shebs . . insert - was denom=1/2p dt=2438