The fist number of L. refer to the standard CtP edition published in 1987. The following number shows correspondence between letters in the new 2010 edition. Note that on this website CtP is available only 1987 edition with minor additions.

[L. 65 | 72] 12 September 1963

I am glad that the cyclostyling has been completed. I assume that the result is at least legible (though of course one cannot expect much more than that from cyclostyling). It is good that you have taken the trouble to compare the finished product with the carbon copy and to arrange for the re-doing of what was necessary: attention to such details is essential if the reader is not to have the impression that the book is simply being thrown at him; and a carefully prepared book is itself an invitation to be read.