Q. why have you removed useful search functions like recently added? and if I tried format to filter colour pics I get nothing
A "recently added" feature is scheduled for late March or early April 2018.
The Revs Digital Library includes a page on all 2018 updates with details on monthly enhancements.
You can search by format in the search box, such as color transparencies.
The Library is open Monday-Friday, 8 am-5 pm