OPCVL - origin purpose value limitation
Move to Global War, p. 48-52.
Evaluating sources (OPVL): https://libguides.ops.org/c.php?g=439680&p=4544774
B History OPVL Chart: http://www.slideshare.net/gabr0088/ib-history-opvl-chart
Move to Global War, p. 48-52.
Evaluating sources (OPVL): https://libguides.ops.org/c.php?g=439680&p=4544774
B History OPVL Chart: http://www.slideshare.net/gabr0088/ib-history-opvl-chart