Statistical Methods, Experimental Design, and Scientific Inference: A Re-issue of Statistical Methods for Research Workers, The Design of Experiments, and Statistical Methods and Scientific Inference
"Along with having direct teaching value, the letters will be an enormous resource as statisticians and other scholars increasingly seek to research, revalue, and place in scientific context the development of 20th century statistics." --Science"A useful, indeed in many respects indispensable, adjunct to Fisher's papers.  In these letters his writing is usually more relaxed, detailed, and as a result, clearer, than in his papers." --Mathematical Reviews