check bookdown issue

[lbuckley]

Use "bookdown::render_book('index.Rmd', 'bookdown::pdf_book')" command to check output. (Will take a long time to run).

These are warming messages I receive. Would appreciate your addressing.

Warning message:
LaTeX Warning: Label radiation' multiply defined. LaTeX Warning: Label eq:radiation-5' multiply defined.
LaTeX Warning: Label eq:soil-11' multiply defined. LaTeX Warning: Reference eq:calcdif-calcdif-1' on page 66 undefined on input l
ine 2521.
LaTeX Warning: Reference eq:calcdif-3' on page 74 undefined on input line 2770 . LaTeX Warning: Reference eq:calcdif-3' on page 76 undefined on input line 2820
.
LaTeX Warning: Reference eq:calcdif-2' on page 76 undefined on input line 2829 . LaTeX Warning: Reference eq:physics-physics-8' on page 140 undefined on input
line 5845.
LaTeX Warning: Reference eq:physics-11' on page 141 undefined on input line 59 22. LaTeX Warning: Reference eq:physics-11' on page 141 undefined on input line 59
27.
LaTeX Warning: Reference eq:thermintro-thermintro-2' on page 158 undefined on input line 6656. LaTeX Warning: Reference eq:thermintro-3' on page 158 undefined on input line
6680.
LaTeX Warning: Reference `eq:thermex-2' on page 169 undefined o [... truncated]

[lbuckley]

Splitting up code code so it better fits on pages would be appreciated.
Also checking table format.

[ys634]

All warnings resolved and codes now fit in page.
Some tables are too big to fit in the page so looking for a solution.