I have seen this question asked before for other US States, but based upon my understanding of Public Land Survey System, each State has its own reference grid. It appears that the US Government once provided a webservice conversion tool called "Geocommunicator", but this is now offline, denigrated, or no longer supported. Is this BLM document of State PLSS geodatabases meant to be a replacement?
To be specific, I need to convert the Township Range Section boundary information for two properties to Lat Long in the State of Louisiana. These properties are in the swamp and are not accessible by road.