At first glance this massive volume seems of little interest to others than public health workers, but as one looks through it, one realizes its possibilities. Here are listed data about every member of this huge association which includes not only physicians but engineers, nurses, administrators, and representatives from every country in the world, even behind the Iron Curtain. If you wish to make a trip, you can look up the geographical section and find someone to write to in Mozambique, Morocco, Mexico, Mali, or Malaya. If you wish to know about disease conditions in the Caribbean, the south Pacific or the Guianas, here are the men and women who know. It makes a foreign trip so much more interesting and profitable to have contacts before you leave.