This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
Sec. 253. Conscious ignorance - Mistake discovered before execution.
Sec. 254. Forgetfulness as mistake.
Sec. 255. Change of position.
Sec. 256. Mutuality of mistake.
Sec. 257. Materiality of mistake.
Sec. 258. Mistake as to rates fixed by statute.
Sec. 259. Materiality of mistake as to adversary party.
Sec. 260. Mistake as to identity of adversary party.
Sec. 263. Mistake as to area.
Sec. 264. Ambiguous offer.
Sec. 265. Mistake in duplicates of written contract.
Sec. 266. Offer using words not intended.
Sec. 267. Mistake in transmission by telegraph.
Sec 268. Offer using words intended, but concerning subject-matter not intended.
Sec. 269. Miscalculations.
Sec. 271. Negligence as affecting mistake in execution.
Sec. 272. Excuses for omission to read.
Sec. 273. Mistake as to legal effect.
Sec. 274. Misunderstanding as to terms - Oral contract.
Sec. 275. Effect of negligence other than in execution.
Sec. 276. Ratification and laches.
Sec. 277. Nature of relief.