Consider that a practice that lead towards clipart. The LaSalle County Platbook contains dozens of pages with similar showing properties drawn by hand. When this book was created, undoubtedly one was created for every other county as well - 42 in all. How many similar books were created for other states and their counties?

How many artists were involved - probably an army, perhaps part of the cartographers jobs in the project. Anyway, hundreds or thousands of such drawings would be required.

Production workflow would be necessary to create such a large project, therefore cows consistently drawn the same way would help in making quicker work of such a large job.

I couldn't imagine the level of work involved, nor the cost in today dollars compared to 1876.