Is this collection gone? I see there is a wiki page for it, but I don't see a way to access to images.
What county? These collections tend to be at the county level.
I see what you are saying; those images have vanished for some reason. The images may have been reorganized into other collections. Do you have more information? EDIT: I mean more information on what or who you are trying to research? If you look in the catalog, there are other collections of Massachusetts Naturalization records.
Ancestry has a record set that includes those years - https://www.ancestry.com/search/collections/2361/
Massachusetts, U.S., State and Federal Naturalization Records, 1798-1950
I was able to find some of the records I'm looking for under the Essex County Naturalizations but I figured I should say something in case it's an error.
In addition to the records that can be found in Ancestry, there are Massachusetts naturalization records in FamilySearch that may fill the gap of the missing index and images for the subject collection.
There is a collection, Massachusetts, Naturalization Records, 1906-1917, that can be found at:
In addition, the FamilySearch Wiki entry, Massachusetts, Naturalization Records - FamilySearch Historical Records, provides a list (with links) to records found in the FamilySearch Catalog and in its collections. This wiki page can be found at:
As an example of the Catalog entries suggested by the above wiki page, you may find the following Catalog entry to be of interest; the title of which is, Massachusetts, District Court naturalization petition records, 1847-1902; and can be found at:
I hope that this helps.