Investigate properties and column view:
http://orgmode.org/org.html#Column-view
To re-work code base with following ideas/questions:
1] Difference between phrase commentary and category/idea annotation
2] Problem with category headings thus for each page.
3] Locations and mapping out eg. Peenemuende map, Usedom coast, Slothrop's route, Berlin route, time route
4] How to handle embedded page numbers
5] Cleaning up electronic GR copy so that we can crosslink in the text itself (and code for this also)
6] How to enter and retrieve categories [as properties] (now using latest org-mode 5.13h):
Problems with adding a single value to a property [we can make property/value pair with C-c C-c s or C-c C-x p but we can't add values]
C-c / p - to retrieve as sparse tree doesn't seem to work so well as we have all headlines at top level - is fine is we have all pages as second level headings
Perhaps working better by adding tags to the page/headline [still with sparse tree problem solved by extra heading level]
7] How thus to work across page/category divide?
From top right [clockwise]: CPU sans memory for test only, AD8313 100Mhz-.2.4GHz broadband receiver, battery, wireless spectrum analysis, USB