Purdue University Sheep Website:
http://ag.ansc.purdue.edu/sheep/
Lambing slideshow from Purdue:
http://ag.ansc.purdue.edu/sheep/lambbirth.html
http://www.ics.uci.edu/~pazzani/4H/Sheep.html
Gates, N. Sheep Obsterics Part1, National Wool Grower, Oct. 1982.
Gates, N. Sheep Obsterics Part2, National Wool Grower, Nov. 1982.
Photos and Figures by Craig Bowen