Good news, the downloads from Heidrich's book on the Swiepwald 3rd July 1866 are now available on the Helion website. Marked as 'Maps' there are also some excellent, detailed charts of OOBs etc as well as Heidrich's maps and Strobl's maps too; find them here - https://www.helion.co.uk/military-history-books/the-battle-for-the-swiepwald-austrias-fatal-blunder-at-koniggratz-the-climactic-battle-of-the-austro-prussian-war-3-july-1866.php