If you keep the total in the same cell you can do this:
On the totals page type =SUM( then click on the first worksheet's tab then hold the Shift key down and click on the last worksheet's tab. Click on B19 where your page totals are, then close parentheses ")".

That will create a sum of all the values in that cell on all of the tabs.

The formula looked like this when I was done:
=SUM('June 13:Sheet25'!B19)