Links
[1] http://www.ctio.noao.edu/noao/node/189
[2] http://www.ctio.noao.edu/noao/sites/default/files/telescopes/ctio/1_5m/Plate_logs_1p5m_1969-1990.csv
[3] http://www.ctio.noao.edu/noao/sites/default/files/telescopes/ctio/Schmidt/SchmidtPlateCat.xls
[4] http://www.ctio.noao.edu/noao/sites/default/files/telescopes/ctio/4m/BlancoPlateCat.xls