"ca. 1780-1800 \nca. 1754-70" . "c.1780" . "1780[ca]" . "ca. 1780" . "1780[ca]-1790[ca] 1701=1800" . "1780[ca]-1790[ca] 1701=1825" . "vers 1780" . "1780~" . "about 1780" . "possibly ca. 1780" . "1780[ca]-1790[ca] 1701=1833" . . . "ca. 1780-1785 \nca. 1760-80 \nca. 1700-50" . "ca 1780" . . . "1780 circa" . "1780~" . "ca. 1742 \n1775 - 1780" .