You are downloading the Theoretical Physics AppXBundle file v2017.831.735.0 for Windows Phone. Theoretical Physics is a free and useful Books & Reference app: The appendix contains a description of theoretical physics. The application includes a handy ... You can now download the offline AppXBundle file to install & try it.
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Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Theoretical Physics AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.