"Mid 19th century" . "probably mid-19th century" . "Middle 19th century" . . "to mid-twentieth century 19th century" . "1826/1875" . "1826=1875" . "1826 / 1875" . "Mid 1800s" . "mid-19th century" . "early to mid 19th century" . . "mid-19th century (?)" . "early 17th to mid-19th century" . "a mitjan segle 19" . . "mid 19th century" . . "mid 1800s" . "Second or third quarter of 19th century" . "early to mid 1800s" . "a mediados siglo 19" .