Eileen Palmer's note says that this correspondence relates to EHM's campagn in the Parliamentary election of 1929 as a birth control candidate but it seems more generally relating to the birth control campaign in those years:
Councillor Irene Fisher, Hampstead, Nov-Dec 1929, including cutting of Fisher's letter to Hampstead Advertiser
Barbara Ayrton Gould, 6 Feb 1929
EHM to A J A Ball, 19 Mar 1930
Amy Baker, National Council of Women, Coventry Branch, 20 Nov 1929, 13 Jan 1930
EHM to Mrs A Barber, Southgate Women's Local Government Association, 31 Oct 1930
Mrs F Barker, 8 Apr 1930, and EHM's reply, 18 Apr 1930
EHM to Sir James Barr, 31 Mar 1930
EHM to Miss Ruth Barrett, Butler St Girls' Club, 1 Apr 1930
E Bertrand, The Deptford Fund, 14 Feb 1930
Jessie Fraser Brown, Dulwich Women's Citizen Association, 19 Sep 1929
EHM to W R Binks, 31 Mar 1930
J O P Bland, postcard 22 Mar 1930, and reply from EHM's secretary, 25 Mar 1930
Flora Blumberg, 14 Apr 1930, and EHM's reply 18 Apr 1930
EHM to C P Blacker, 20 Jun 1930
Mrs Blowers, London Cooperative Women's Guild, 21 Feb 1930, and EHM's reply 28 Feb 1930
Mrs J A A Blunt, 4 Feb 1930, enclosing cuttings from Rotherham Advertiser [only one with letter], EHM's letter to the Editor, 8 Feb 1930, and her secretary's letter to Mrs Blunt, 8 Feb 1930
Mary Breed (EHM's secretary) to Mrs Bond, Leicester
H Bradlaugh Bonner, 18 Mar 1930, and reply from EHM's secretary, 15 Mar 1930
EHM to Mrs Bower, 28 Jul 1930
Miss K Bradshaw, 11 Apr 1930, and EHM's reply, 17 Apr 1930
Cecile Booysen to Mary Breed, 10 and 16 Feb 1930
Phyllis Brand (Lady Astor's sister), n.d.
Mrs C J Brown, 30 Oct 1930
EHM to A K Bulley, 17 Mar 1930
John Breese, Birmingham, 24 Dec 1929, and letter to him from EHM 19 Mar 1930
EHM to Miss D Bullock, 17 Mar 1930, with list of Derbyshire members of Women's Cooperative Guilds interviewed during Election Campaign
M F Bechler, 21 Oct 1930, and reply from EHM 22 Oct 1930
William S Baxter, gynaecological clerk St Bart's Hospital, 11 and 13 Sep 1930, reply from EHM, 12 Sep 1930
Mrs Edith Batchelor, Feb 1930, and reply from EHM 3 Feb 1930
Mrs Bedhall, 24 May 1930, and reply from EHM's secretary, 26 May 1930
A P Busch-Michell, from Louise M Thompson, 15 Apr, 4 Jun 1929, Busch-Michel to Louise M Thompson 13 Jun 1929; EHM to Busch-Michel, 17 and 22 Mar, 17 Oct, and 5 Dec 1930; Busch-Michel to EHM, 21 Mar and n.d. 1930
S W Cocks to Louise M Thompson, 7 Feb, 19 Mar 1929
Lady Emmott, 17 Nov 1929, and reply from EHM, 21 Nov 129
Elizabeth Freeth, 14 Jan 1929
Dame Katharine Furse, 27 Feb 1929, and letter to her from EHM 24 Apr 1929, cc'd to Dr C W Saleeby
Dorothy Gordon, 28 Apr, 7 Jun 1930
Mrs Gram Swing 10 Apr 1929, and reply from EHM 17 Apr 1929
Mary S Hicks, 8 Nov 1929