introductions to the letters of pliny the younger from print editions

This is mainly for those participants in the October 21 chat on the Letters of Pliny the Younger who do not have a print copy.

I went to Google Books and found previews of two major print editions.  One  offers  the complete introduction, the other the larger part, meaning some pages are blank, nonetheless giving as excellent an overview and discussion of the letters. (The latter is the copy I have.)  Considering that we have only one chat, and also in general, these chapters can be quite helpful to the understanding of Pliny the person and Pliny the letter writer.

• Oxford World Classics Edition (Patrick Gerard Walsh)
  Complete Introduction and Note on the Text & Translation.
  Click on arrows to get to the Introduction.
  
• The Penguin Classics Edition (Betty Radice)
  Incomplete introduction. It also shows appendices, such as a reconstructed plan of Pliny's house at Laurentum. ("Content: Inscriptions," scroll down)

Statue of Pliny the Younger on the façade of
the Cathedral of S. Maria Maggiore in Como
Courtesy Wikimedia Commons