This is the 16899th most frequent Russian word.
содержащихся
"Contained" or "included."
Here, 'содержащихся' is used as a present participle passive to describe what is contained.
В книге описаны все ингредиенты, содержащихся в рецепте.
The book describes all the ingredients contained in the recipe.
In this context, 'содержащихся' identifies documents that are located or stored in the archive.
Список документов, содержащихся в архиве, оказался неполным.
The list of documents contained in the archive turned out to be incomplete.
'Содержащихся' specifies the details or items that are within the table.