History (full year – the lower center and right books get used for the next 4 years)
Science (half year)
Literature and early readers (full year)
English, writing, reading, and so on (full year)
Math and manipolatives for half the year (challenging word problems is full year and manipolatives can be reused as needed obviously).
And not to be left out, a book for Nathaniel (lasts 5 years).