You may possibly have read my little monograph upon the subject. (Quelle: Projekt Gutenberg)
Here is my monograph upon the tracing of footsteps, with some remarks upon the uses of plaster of Paris as a preserver of impresses. (Quelle: Projekt Gutenberg)
An illustrated monograph of a fascinating algal order. (Quelle: bmb+f Forschungslandkarte Deutschland 1998)