Q. How can I view Harvard's Oliver Wendell Holmes materials? Are they available online?

This answer uses material that came from Ed Moloy in Special Collections.

All of our Holmes materials has been digitized.  It is available and searchable through the HLSL Oliver Wendell Holmes Jr. digital suite.

The letters between Holmes and Laski are in the John G. Palfrey (1875-1945) Oliver Wendell Holmes, Jr. Papers collection. You can also use the finding aid for this collection.

For this particular question, the user was looking for letters between OWH and Harold Laski.  In the finding aid, you will see that this correspondence is part of Series I, Subseries E.  The letters are organized chronologically, in groups.

The scans of the handwritten materials are very high-quality, although the handwriting can be a bit hard to read.