There is an unknown number of cards in this series as these do not appear in The Nickel Tour; I'm assuming there are 24 based on the numbers I have.

WDC-1	WDC-2	WDC-3	WDC-4
WDC-5	WDC-6	WDC-7	WDC-8
WDC-9	WDC-10	WDC-11	WDC-12
WDC-13	WDC-14	511-015	WDC-16
WDC-17	WDC-18	WDC-19	WDC-20
511-021	511-022	WDC-23	WDC-24