Here goes another one. Porter Square’s McIntyre & Moore Booksellers is closing, resident Ron Newman said Friday on the Davis Square LiveJournal after noticing a sign describing the increasing discounts available through the likely closing date, June 5. (The discounts start at 30 percent off and arrive at 70 percent off at the end of May.)

The store is going Internet-only, according to its website.

That removes 45,000 volumes for browsing and buying from the square and follows the June closing of the store’s ground-floor annex.

The store is downstairs at 1971 Massachusetts Ave., a neighbor to the last Bob Slate Stationer, which was in Cambridge for 78 years but is in the final throes of shutting down after failing to find the right buyer. (Saturday may well have been the final day.)

The academically oriented used bookstore opened in Harvard Square in 1983, staying for 15 years, then moved to Somerville’s Davis Square for a decade. It moved back to Cambridge in April 2008, losing about half its space by taking over what was once the Bookcellar Café, another seller of used books, and later Unicorn Books & Spiritual Resource Center. The space had been lacking a permanent tenant for about two years.

“You’d think Cambridge would be a place that wants to sustain a bookstore,” Dan Moore said in August.