Simple Question: How to Load corpora (.txt files) in R

Context: I have 47 .txt files which are all technically small corpora. They have been lowercased and full-stops have been removed.

Question: Would anyone know how to or be able to point me to a resource that explains how to load these in R? I wish to lemmatise them and extract collocations (nearest neighbours) within a term with a window size of 3 + their counts per corpus + proportion (count of collocate/ total tokens in corpus).

Any resources/ tips would be much appreciated. It might be a simple solution. I am completely new to handling corpus data, but have tried the below code so far which did not work:

corpus - load.corpus(corpus1.txt)