How do I restore my operating system from Snow Leopard back to Mountain Lion on line after erasing my hard drive?

I had to erase my hard drive.  I loaded Snow Leopard with the disk I got with my computer, but I purchased Mountain Lion several months ago and don't have support any longer.  How do I get back to the Mountain Lion operating system, on line?

Upgrading to Snow Leopard
You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mavericks if your computer meets the requirements.
     Snow Leopard General Requirements
       1. Mac computer with an Intel processor
       2. 1GB of memory
       3. 5GB of available disk space
       4. DVD drive for installation
       5. Some features require a compatible Internet service provider;
           fees may apply.
       6. Some features require Apple’s iCloud services; fees and
           terms apply.
You must perform the last step - updating to 10.6.8. Until then you have no access to the App Store. When you can sign into the App Store using the same Apple ID with which your purchased Mountain Lion, click on the Purchases icon in the toolbar. Locate your Mountain Lion purchase line then click on the Install button on the right to re-download.

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