Based on the clue 'a collection of 11th 12th century epigrammatic qu...', what is the answer?

Based on the clue 'a collapsed cavity in the ground caused by water e...', what is the answer? Based on the clue 'a collapsible chair intended for outdoor use espec...', what is the answer? Based on the clue 'a collar called the manta ray makes this knee bend...', what is the answer? Based on the clue 'a collection by joyce carol oates is called women ...', what is the answer? Based on the clue 'a collection of digital info organized for conveni...', what is the answer? Based on the clue 'a collection of essays by joan didion is called sl...', what is the answer? Based on the clue 'a collection of fluid beneath the outer layer of s...', what is the answer? What is associated with: a collection of his letters from main street to stockholm was published posthumously in 1952?