California Teachers Association was created in 1863-05.
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I have no idea but there are probably less. Teachers in CA are
getting pink slips because of the budget and art teachers are
usually one of the first to go. Go to the California Teachers
Association web site and they may have that data.
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Ethiopian Teachers' Association was created in 1949.
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Alberta Teachers' Association was created in 1918.
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Association of Teachers of Mathematics was created in 1950.