The Book of Stars: Being a Simple Explanation of the Stars and Their Uses to Boy Life English 897h 25m read
Short Cuts in Figures - to which is added many useful tables and formulas written so that he who runs may read English 1053h 34m read
The Radio Amateur's Hand Book - A Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony English 1104h 20m read
The Radio Amateur's Hand Book - A Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony English 1117h 4m read