The government corporation tasked with managing federal prison labor has refused to release the names of private companies that contract for access to its low-paid, incarcerated labor pool.

The Massachusetts Department of Public Health has so far refused to disclose documents that might clear up its dispensary approval and scoring process. Documents released so far leave a number of questions, down to basic arithmetic.

Newly disclosed documents reveal FBI field offices around the country took measures to prepare for an anticipated U.S. visit by legendary Vietnamese general Vo Nguyen Giap in 1993. But, for reasons that remain unclear, the potentially historic trip never came to pass.

These two quick tips could make a big difference when requesting public documents from the agency.