identify 5-10 collections that express date in a variety of different ways (to test out decade'ing)

[christinklez]

Sample records with a variety of date expressions: https://docs.google.com/spreadsheets/d/1JNw7ynxCJS8d4f5W4Glwwqx0qMm8ss-aB_GpjVxN1dI/edit?gid=0#gid=0