Try this sample file. I think the trick is rotating the PDF 90 degrees CCW and saving it so that when opened in PORTRAIT mode it is displayed in landscape. That way there is no tendency for the reader to split the document pages into two parts as you don't need to use landscape mode at all.

Keep in mind that this is a low grade sample document that I quickly made by doing a screen capture of your PDF file, rotating the screen capture 90 degrees CCW, and pasting it into a MS Word document that I set up with 0 inch margins and a page size of 4x6 inches. I then saved it as a PDF. A much better job could be done with time and experimentation.

[edit]Oops, I forgot to attach the file....My bad![/edit}

...