The following is a list of 23 books (most in PDF format) about ‘Canning, Preserving, Pickling and Dehydrating Food’ (As far as I know, these books are not in copyright.)
1. “Home and Farm Food Preservation” (1918): _http://ia700301.us.archive.org/1/items/homefarmfoodpres00cruerich/homefarmfoodpres00cruerich.pdf
2. “Canning and Preserving” (1887): _http://ia700308.us.archive.org/24/items/canningpreservin00rorerich/canningpreservin00rorerich.pdf
3. “Dehydrating Foods Fruits, Vegetables, Fish and Meats” (1920): _http://ia700307.us.archive.org/13/items/dehydratingfoods1920andr/dehydratingfoods1920andr.pdf
4. “Everywoman’s Canning Book: The ABC of Safe Home Canning and Preserving” (1918): _http://ia600504.us.archive.org/21/items/everywomanscanni00hughrich/everywomanscanni00hughrich.pdf
5. “Preservation of Food: Home Canning, Preserving, Jelly-Making, Pickling, Drying” (1910): _http://ia700208.us.archive.org/9/items/preservationoffo00hayerich/preservationoffo00hayerich.pdf
6. “Successful Canning and Preserving; Practical Handbook for Schools, Clubs and Home Use” (1917): _http://www.icsarchive.org/icsarchive-org/paperback/successful_canning_and_preserving_1917.pdf and _http://archive.org/details/successfulcanni00powegoog
7. “Canning, Preserving and Pickling” (1914): _http://www.armageddononline.org/uploads/Canning__preserving_and_pickling.pdf and _http://archive.org/details/canningpreservi00neilgoog
8. “Recipes for the Preserving of Fruit, Vegetables and Meat” (1908): _http://ia700308.us.archive.org/9/items/recipesforpreser00wagnrich/recipesforpreser00wagnrich.pdf
9. “Home Canning by the Cold Pack Method” (1917): _http://ia700202.us.archive.org/20/items/homecanningbycol00smitrich/homecanningbycol00smitrich.pdf
10. “Balanced Meals with Recipes: Food Values, Drying and Cold Packing Menus” (1917): _http://ia700400.us.archive.org/22/items/balancedmealswit00lake/balancedmealswit00lake.pdf
11. “The Hygienic Cook-Book Containing Recipes for Making Bread, Pies, Puddings, Mashes, and Soups, With Directions for Cooking Vegetables, Canning Fruit, Etc.” (1881): _http://ia600202.us.archive.org/14/items/hygieniccookbook00joneiala/hygieniccookbook00joneiala.pdf
12. “War Food Practical and Economical Methods of Keeping Vegetables, Fruits and Meats” (1917): _http://vintagecookbooks.healthyeatingandlifestyle.org/books/1917warfood.html and _http://archive.org/details/warfoodpractica00handgoog
13. “A Treatise on Food Conservation and the Art of Canning” (1917): _http://ia700500.us.archive.org/9/items/treatiseonfoodco00snyd/treatiseonfoodco00snyd.pdf
14. “Methods of Canning Fruits and Vegetables by Hot Air and Steam” (1890): _http://scholar.lib.vt.edu/digital_books/pdf/TX603.B58_1890.pdf
15. “Uncle Sam’s Advise to Housewives covers canning, drying, storage” (1917): _http://ia700306.us.archive.org/30/items/unclesamsadvice00admigoog/unclesamsadvice00admigoog.pdf
16. “Food Drying Progress and Importance” (1919): _http://ia700307.us.archive.org/4/items/fooddryingprogr00commgoog/fooddryingprogr00commgoog.pdf
17. “Preserving and Canning: A Book for the Home Economist” (1914):
_http://ia600209.us.archive.org/20/items/preservingcannin00ries/preservingcannin00ries.pdf
18. “Preserving and pickling: Two Hundred Recipes for Preserves, Jellies, Jams, Marmalades, Pickles, Relishes, and Other Good Things” (1918): _http://books.google.com/books?id=Sj8EAAAAYAAJ&printsec=frontcover&dq=subject:%22Canning+and+preserving%22&lr=&as_brr=1&ei=bvWiS6GpNoa-zATz_7jlCA&cd=60#v=onepage&q&f=false
19. “The Book for all Households or the Art of Preserving Animal and Vegetable Substances for Many Years” (1920): _http://ia600302.us.archive.org/25/items/bookforallhouseh00appeuoft/bookforallhouseh00appeuoft.pdf
20. “The Whole Art of Curing, Pickling and Smoking Meat and Fish” (1847): _http://ia700506.us.archive.org/14/items/wholeartofcuring00robi/wholeartofcuring00robi.pdf
21. “Lowney’s Cook Book” (1907): _http://ia600309.us.archive.org/5/items/lowneyscookbooki00howa/lowneyscookbooki00howa.pdf
22. “The Complete Housekeeper” (1917): _http://ia600409.us.archive.org/4/items/cu31924000624092/cu31924000624092.pdf
23. “How to Save Money on Food: Home Canning” (1917): _http://books.google.com/books/about/How_to_save_money_on_food.html?id=yFIKAAAAIAAJ