The Directorate General for Foreign Trade, Belize has released an economic publication entitled: Belize's Pulse in Latin America. It focuses on the PSA's between the countries, and while it covers all of Central America, it goes in depth about the trade between Belize and Guatemala.
"Take a deeper look at Belize's trade with Latin America and the opportunities presented by Belize's trade agreements with countries in this region."
https://issuu.com/dgftbz/docs/belize_s_pulse_in_latin_america-_april_2020