diff --git a/html/src/front.md b/html/src/front.md
index a9e8bcb..438be5d 100644
--- a/html/src/front.md
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@@ -12,13 +12,15 @@ I have scaled down some of these materials to eBook size, for easier reading on
 
 -
   Homotopy Type Theory Book
-  [[cached](https://git.mzhang.io/school/type-theory/raw/branch/master/resources/HoTT.pdf)]
-  [[live](https://hott.github.io/book/hott-ebook.pdf.html)]
+  [[ebook-sized pdf](https://hott.github.io/book/hott-ebook.pdf.html)]
 -
   On the Formalization of Higher Inductive Types and Synthetic Homotopy Theory, by Floris van Doorn (2018)
-  [[ebook](https://git.mzhang.io/school/type-theory/raw/branch/master/resources/VanDoornDissertation/dissertation.pdf)]
-  [[original](https://florisvandoorn.com/papers/dissertation.pdf)]
+  [[ebook-sized pdf](https://git.mzhang.io/school/type-theory/raw/branch/master/resources/VanDoornDissertation/dissertation.pdf)]
+  [[original pdf](https://florisvandoorn.com/papers/dissertation.pdf)]
 -
   A Concise Course in Algebraic Topology, by J.P. May (2007)
-  [[ebook](https://git.mzhang.io/school/type-theory/src/branch/master/resources/MayConcise/ConciseRevised.pdf)]
-  [[original](https://www.math.uchicago.edu/~may/CONCISE/ConciseRevised.pdf)]
+  [[ebook-sized pdf](https://git.mzhang.io/school/type-theory/src/branch/master/resources/MayConcise/ConciseRevised.pdf)]
+  [[original pdf](https://www.math.uchicago.edu/~may/CONCISE/ConciseRevised.pdf)]
+- 
+  [[ebook-sized pdf](https://git.mzhang.io/school/type-theory/raw/branch/master/resources/CCHM/main.pdf)]
+  [[original pdf](https://arxiv.org/pdf/1611.02108)]