561 Group Books
Books from the 561 Group, as EPUB and PDF. Every edition is proofread independently, and each book's page gives the digests of the exact files you receive.
Find an item
13 items
Understanding Infection-Associated Chronic Illness
A public guide to Long COVID, post-exertional malaise, and infection-associated chronic illness: what is established, what is a well-supported hypothesis, and what remains contested. This is educational material, not medical advice.
- Price
- $9.00
- Formats
- EPUB and PDF
- Length
- 6 parts, 57 pages
- Long COVID
- post-exertional malaise
- ME/CFS
- pacing
- chronic fatigue
- post-viral illness
View Understanding Infection-Associated Chronic Illness
Coming soon
The Agent Operator's Handbook
A field guide to operating several AI coding agents at once: writing the complete brief, when to split work and when not to, steering a running agent, recovering an interrupted one, and reading its report.
- Price
- $12.00
- Formats
- EPUB and PDF
- Length
- 13 parts, 62 pages
- AI coding agents
- agentic coding
- AI pair programming
- multi-agent workflow
- prompt engineering
- software engineering workflow
View The Agent Operator's Handbook
Coming soon
The x402 Economy
How the web’s unused payment code became a way for software to pay, and what it has earned so far: HTTP 402’s history, one paid request step by step, who governs x402, its rivals, the market measurements, security and US law.
- Price
- $9.00
- Formats
- EPUB and PDF
- Length
- 13 parts, 63 pages
- x402
- stablecoins
- agent payments
- HTTP 402
- machine payments
- API monetization
Causeway Study Companions · 1
Project Management, Course by Course
A study companion to Google’s Project Management Certificate: one chapter per course, self-checks with answers, and a guide to the capstone. Independent of Google and Coursera.
- Price
- $9.00
- Formats
- EPUB and PDF
- Length
- 12 parts, 82 pages
- project management
- Google certificate
- Coursera
- study guide
- project management certificate
- agile and scrum
Causeway Study Companions · 2
Project Management Fundamentals, Domain by Domain
A study companion to PMI’s CAPM exam that follows the 2023 outline task by task and ends with a 40-question practice exam. Independent of PMI.
- Price
- $12.00
- Formats
- EPUB and PDF
- Length
- 11 parts, 82 pages
- CAPM
- PMI
- project management
- exam prep
- project management certification
- agile and scrum
Causeway Study Companions · 3
Data Analytics, Course by Course
A study companion to Google’s Data Analytics Certificate: spreadsheets, SQL, Tableau and Python, with tested code and answered self-checks. Independent of Google and Coursera.
- Price
- $9.00
- Formats
- EPUB and PDF
- Length
- 11 parts, 62 pages
- data analytics
- SQL
- Python
- Google certificate
- study guide
- data analyst certificate
Causeway Study Companions · 4
UX Design, Course by Course
A study companion to Google’s UX Design Certificate: the design process from its sources, accessibility throughout, and a portfolio guide. Independent of Google and Coursera.
- Price
- $9.00
- Formats
- EPUB and PDF
- Length
- 11 parts, 66 pages
- UX design
- accessibility
- Google certificate
- study guide
- UX design certificate
- user research
Causeway Study Companions · 5
Business Management, Course by Course
A study companion to Cornell’s Business Management Essentials certificate: finance, marketing, strategy, organizing and leading. Independent of Cornell.
- Price
- $12.00
- Formats
- EPUB and PDF
- Length
- 10 parts, 61 pages
- business management
- eCornell
- study guide
- management certificate
- leadership
- business fundamentals
Causeway Study Companions · 6
Business Strategy, Course by Course
A study companion to Cornell’s Business Strategy certificate: value, disruption, alliances, game theory and platforms. Independent of Cornell.
- Price
- $12.00
- Formats
- EPUB and PDF
- Length
- 10 parts, 58 pages
- business strategy
- eCornell
- game theory
- study guide
- strategy certificate
- competitive strategy
The Whirling Crystal
A working account of a live mathematics program, tracing a path from Fregean predicate application through Belnap’s FOUR, Chu spaces and Hoare programs to the gyrobifastigial cell, the dervish defect, witnessed time, thermodynamic cost and…
- Price
- $29.00
- Formats
- EPUB and PDF
- Length
- 12 parts, 154 pages
- predication
- Belnap FOUR
- Chu spaces
- formal methods
- knowledge representation
Coming soon
The Second Day
A health-synthesis newsletter about infection-associated chronic illness. No subscription is open yet.
Coming soon
Duluth Romance · 1
Ice Out
June Tam comes home to Duluth for one winter to help run her family's Cantonese restaurant after her father's stroke. Anders Holm, who washed dishes there at sixteen and now raises the Aerial Lift Bridge, has loved her for eleven years…
- Price
- $3.99
- Formats
- EPUB and PDF
- Length
- 18 parts, 93 pages
- slow burn romance
- closed door romance
- books like C-dramas
- Chinese American romance
- fake dating
- second chance romance