プログレッシブ和英中辞典(第３版)の解説
しょめん【書面】
1 〔書類〕a (written) document
- 要請を書面にする
put one's request in writing - 書面で申し込む
apply in writing
2 〔手紙〕a letter
- 書面で知らせる
let ((a person)) know by letter
3 〔文面〕the contents (of a letter)
- 書面だけでははっきりしない
It isn't clear 「from the contents alone [simply from what the letter says].
書面審理｜〔裁判の〕an examination of the documentary evidence