Upvote:1
They're scattered all over the internet. For example the Evian Accords for Algeria:
A large number of colonies simply voted to be independent:
https://en.m.wikipedia.org/wiki/French_constitutional_referendum,_1958
https://en.m.wikipedia.org/wiki/Afars_and_Issas_independence_referendum,_1977
Generally, an independence document is only needed if independence comes as part of a peace treaty at a conclusion of a war, when there are two parties to negotiate the terms. There is probably too much involved in setting up an independent government from scratch for a single document to be useful. And if the government has already reported the results of a referendum, anything further is unnecessary.