PRINT ALERT. If you want to print them on A4 size paper the best approach is:
 to download them as they are
 open them in your pdf reader, such as Adobe [other pdf readers are also available]
 go to print
 if you want to print them back to back, using the whole page and not using lots expensive colour ink then choose the following settings:
4.1 select Current page and go through 1 page at a time – printing the next page back to back or choose either the odd or the even numbers NOT All
4.2 select Print greyscale [black and white]
4.3 select Fit for the size options
4.4 check you have A4 paper loaded
4.5 print your page[s] then choose the next page or the even/odd numbers depending on 4.1 [ but dont rush it, do a test page to make sure you are printing the pages in the right order.
With apologies to all for whom such stuff is second nature.