Enable my salespersons to see each other's Accounts and Contacts

Enable my salespersons to see each other's Accounts and Contacts

I am the Administrator and have set up about 1000 Accounts with Contacts. Now I have two salespersons and have assigned some of the Accounts and Contacts to each of them. It appears that each salesperson can see only his Accounts and Contacts. I would like for them to be able to see each other's Accounts and Contacts but not all of the others that I have not assigned to them. Any way to accomplish this?