Many dealers should have in stock some inexpensive examples of the following coins from that era...
Indian Head Cent - 1859-1909
Liberty Head Nickel (also known as "V" nickel) - 1883-1913
Barber Dime - 1892-1916
Barber Quarter - 1892-1916
You might also want to try using the web site, http:
www.coinfacts.com, in your presentation to the class. The site has pictures of each of the coins minted during the era you specify and can provide you details such as the designer, the material, etc.
Hope this helps.