Recently, Popular Science teamed up with Google to digitize their archives. Here are some interesting seed related articles I found in Popular Science's archive on Google Books.
My favorite of the bunch is Growing Garden Seeds Now Industry Giant. It takes you on a behind the scenes look at a seedman's nursery and shows how several seeds are harvested processed and stored before landing in home gardener packets.
May 1933, page 28
Seeds stored in bags are apt to become infested with bugs and so ... Collected in trays, the ripe seeds are washed in screen-bottomed containers.
May 1897, page 106
SEEDS that remain in keeping without losing the faculty of germination are ... Van Tieghem and Bonnier proves that seeds may retain their vitality for a ...
January 1940, page 108
Spurred on by this success, he tried his flotation system on other seeds. ... At first, he thought it was because fertile seeds were heavier. ...
October 1921, page 66
The seeds are placed on the covering and then protected from the outside ... The percentage of seeds that eventually sprout is the evidence upon which the
October 1920, page 48
Separating Seeds by Their Shape A NOVEL seed-separator divides round ... It consists of two series of spiral channels through which the seeds are passed.
More results here.