This image shows the prodigious amount of logs that would be loaded onto a two-horse sled for transport to the nearest mill. Presumably the additional weight of the lumbermen and driver did not add a meaningful amount to the effort required by the horses.
Published by C. J. Shoff and Son, Cadillac, Mich.
The men appear to be equipped with a typical tool of the era called a Peavey, a pointed variation of the cant hook.
The card was used and is dated 23 July 1909.