as for the months, my notes say June, July, Aug and Sept for Foster, Bennett, Mack and Cox. the SS website says May, Jun, July, Aug for the four books, but then the SS website also has Mack's The Sorrows of Empire as Dec 2009.
There's no contradiction there. A book with a June publication date will actually come out in mid- to late May. A book with a January publication date will actually come out in mid- to late December. I'm not sure why that is, but it's the way it works.
that's exactly what I said in the first paragraph of my post. Here, I was going to just say the SS website agree with my dates, but then people will nitpick and say but the SS website don't. That's why I wrote these dates, and wrote the date for The Sorrows of Empire.