Yeah, he has an essay in reference 4 called "Indistinguishable Space-Times and the Fundamental Group":
https://conservancy.umn.edu/server/api/core/bitstreams/335ef91d-a05c-4832-8fc1-d15e54eb9913/content which Google tells me has been cited as recently as last year. On 1/29/25 8:18 PM, Frank Wimberly wrote:
My former boss Clark Glymour is cited multiple times in that paper.
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