What do you mean by "no longer searchable"? The titles are searchable inside ResearchGate, e.g. https://www.researchgate.net/search.Search.html?query=A+Critical+Assessment+of+CIA+Intelligence+During+the+Indochina+War%2C+1950%E2%80%931954&type=publication. - Concerning weekly reports and other system-generated messages from RG: Check the settings in https://www.researchgate.net/settings/emails.