In case anyone else has been looking some of these, there is a listing for multiple tubes-of-11 on eBay at a moderate price:
https://www.ebay.com/itm/123710245814
QTY-11 PCS. AMI SEMICONDUCTOR DC319 C04090 Integrated Circuit - (UIC
40378901)
It's documented in the DEC Semiconductor Data Book, Volume 1 (1987), pages
3-27 through 3-41:
http://bitsavers.org/pdf/dec/semiconductor/
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