diff --git a/old_artifacts/README.md b/old_artifacts/README.md
index a8be47f..1818155 100644
--- a/old_artifacts/README.md
+++ b/old_artifacts/README.md
@@ -10,3 +10,7 @@ original manufactured and distributed artifacts.
   mass-production manufactured Macintosh SE main logic board, as is
   typically photographed for the sake of Internet forum communications
   and sales, as opposed to reproduction-oriented photos.
+
+* (pcb_photos)[pcb_photos]: Photographs of the bare printed circuit
+  boards, suitable for assisting the setup of modern manufacturing
+  reproduction of the boards.
diff --git a/old_artifacts/pcb_photos/README.md b/old_artifacts/pcb_photos/README.md
new file mode 100644
index 0000000..9dec1c3
--- /dev/null
+++ b/old_artifacts/pcb_photos/README.md
@@ -0,0 +1,4 @@
+This directory contains photos of the bare printed circuit boards
+(PCBs).  That is, all discrete components are unpopulated from the
+surfaces of the printed circuit board.  The most important bare PCB
+photos are those of the Main Logic Board (MLB).
diff --git a/old_artifacts/schems/retrace_se_mlb_p1.pdf b/old_artifacts/schems/retrace_se_mlb_p1.pdf
deleted file mode 100644
index 408abfa..0000000
Binary files a/old_artifacts/schems/retrace_se_mlb_p1.pdf and /dev/null differ