Week 2

Lecture 1.11: Craters and surface ages

The link to the Hartmann paper is here (you'll go to a request form, and must put in document ID: 19730023955 and the name of the document "Martian cratering 4: Mariner 9 initial analysis of cratering chronology" and they'll send you the pdf in under 24 hours. Painful but effective.
A much more modern update of the Hartmann paper is here, which also requires a subscription, but a Google Scholar search might help you out here.
Wikipedia on the Late Heavy Bombardment is good.

Lecture 1.12: Outflow channels

A list of outflow channels can be found on Wikipedia
The USGS has great information on the channeled scablands and this site has great pictures and much detail
Significantly more mathematical detail on channel flow
A few papers calculating the outflow in Kasei Valles can be found here (subscription) here (non subscription, but sometimes link doesn't work; keep trying), and -- a more recent calculation -- here (subscription, but findable via Google Scholar)

Lecture 1.13: Valley networks

A good beginning discussion of outflow channels and valley networks is here
The Carr paper is a nice read.
A very nice article from Emily Lakdawalla of the Planetary Society on valley networks
A great overall review of water on Mars by Carr is worth taking the time to read.

Lecture 1.14: Climate cycles on Mars

Here is a cute online tutorial about terrestrial Milankovitch cycles
The Wikipedia article on terrestrial Milankovitch is nicely detailed.
The Tourna and Wisdom paper requires a subscription, but you can find a pdf at Jack Wisdom's website
The Laskar et al. paper requires a subscription, but a Google Scholar search turns up a pdf

Lecture 1.15: Was early Mars warmer and wetter?

To learn more about phase diagrams and triple points, Wikipedia is good, if over detailed.

Lecture 1.16: Atmospheric escape

A nice Scientific American article on atmospheric escape throughout and beyond the solar system is here
Wikipedia gives a good general overview without much detail
A slideshow presentation on atmospheric escape gives details of the math

lecture 1.17: Martian topography

The MOLA homepage is a wealth of information
The Head et al. paper give a lot of detail on the northern plains as a potential ocean bottom
The Di Achille and Hynek paper requires a subscription, but scrolling down through the Google Scholar links finds a pdf of a substantially similar paper

Lecture 1.18: Gamma ray spectroscopy and subsurface water

Wikipedia, on gamma ray spectroscopy
The Mars Odyssey Gamma Ray Spectrometer home page
The Boyton et al. paper appears to be unavailable without a subscription even though the research was ~100% publicly funded (nope; Google Scholar now finds it). Is that right? You might have guessed my opinion by now. A graphical representation of the main results can be found here, though.
The press release on fresh impact craters and ice

Lecture 1.19: Glaciers on Mars!

To read more about how glaciers work on Earth, start with Wikipedia
The two papers about glaciers on Mars can be found in a single Google Scholar search
The SHARAD observations and the paper describing them are beautiful.

Lecture 1.20: Origin of low latitude ice

The Mischna et al. paper is unavailable without a subscription, and you probably don't need to read it unless you really really want the details. But Google Scholar knows where to find it.
You can find the Forget et al from the Google Scholar search for the previous lecture.