@jcorippo: June 25, 2015 at 07:50AM

@jcorippo- happy to discuss: as of January we created a "community contributed" tab...id's "underground users" 100,000 flexbooks are up!

— CK-12 Foundation (@CK12Foundation) June 25, 2015

via jcorippo

Put the internet to work for you.

Delete or edit this Recipe